spiral duct equipment manufacturers are as follows:

1. Beijing Xinyang Hengtong Ventilation Equipment Co., Ltd.

Main products: ventilation pipes; Exhaust duct, kitchen exhaust duct, air conditioning duct, stainless steel exhaust hood, spiral duct, fan, oil fume purifier.

address: Tongzhou garden international seed science and technology park, Zhongguancun science and technology park, Tongzhou district, Beijing.

2. Wuxi Great World Ventilation Equipment Co., Ltd.

Main products: 314 stainless steel spiral duct; Rectangular air duct; * * * plate flange duct; Welded air duct; Angle steel flange; Galvanized flange; Duct flange.

address: No.18, Zhuhai Road, Xinjie Street, Yixing City.

3. Jiangsu Changda HVAC Equipment Co., Ltd.

Main products: Suqian ventilation pipeline processing factory installation, Suzhou duct factory direct sales, Xuzhou duct factory direct sales, Huai 'an duct factory direct sales.

address: No.27, Hongzehu West Street, Sihong County.

4. Henan huafeng ventilation equipment co., ltd.

main products: Zhengzhou air duct, Zhengzhou spiral duct, Zhengzhou air duct processing plant, Zhengzhou static pressure box, Zhengzhou louver, Zhengzhou smoke exhaust and ventilation project.

address: Yuzhong steel market at the intersection of South Fourth Ring Road and Zheng Xin Expressway.

5. Changzhou Peng 'ao Air Conditioning Equipment Co., Ltd.

Main products: including spiral duct, angle iron flange air duct, stainless steel air duct, * * * plate flange air duct, galvanized iron sheet air duct, welded air duct and environmental protection equipment.

address: No.6 Xinzhi Road, South Zone, Wujin National High-tech Industrial Development Zone, Changzhou.